Means for swaging metal dental plates.



NORRIS CLAYTON LEONARD, OF MCMINNVILLE, TENNESSEE.

MEANS FOR SWAGING METAL DENTAL PLATES.

SPECIFICATION formingpart of Letters Application filed .l' uly 7, 1900.

To all whom it may concern Beitknown that I, NORRIS CLAYTON LEON- ARD, acitizen of the United States, and a resident of McMinnville, in thecounty of Warren and State of Tennessee, have invented anew and'ImprovedMeans for Swaging Metal Dental Plates, of which the following is a full,clear, and exact description.

The purpose of the invention is to provide devices which furnish simpleand effective mediums for swaging metal dental plates directly on aplaster model, thus producing a more accurately fitting plate thanordinarily and which obviates the necessity of making counter-dies, thussaving much time and labor and likewise preventing the plate from beingscarred.

The invention consists in the novel construction and combination of theseveral parts, as will be hereinafter fully set forth, and pointed outin the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is aperspective View of the plaster model audits casing. Fig.2is avertical section through a plastic block and through the modelshown in Fig. 1 introduced into said block. Fig. 3 is a vertical sectionthrough a matrix formed as shown in Fig. 2. Fig. 4 is a vertical sectionthrough a metal model formed in the said matrix and throughabinding-ring which extends around the metal model, which ring isremovable from the model. Fig. 5 is a partial side elevation and partialvertical sectional view of an upper die adapted for use in connectionwith either the metal or the plaster model, the metal model being shownin connection with the die in this figure. Fig 6 is a view similar toFig. 5, illustrating the plaster model in operative connection with theupper die. Fig. 7 is a perspective View of a swaged upper dental plate,and Fig. 8 is a vertical section through the lower portion of the upperdie.

A cast A is taken of that portion of the mouth to which the plate is tobe fitted. This cast is of plaster, and the plaster cast A,Which may betermed a model, is fitted in a casing-ring 10, whose sides taperoutwardin direction of the bottom. This plaster model Patent No. 674,581, datedMay 21, 1901.

Serial No. 22,821. (No modeland its casing-ring are placed in a block orbed B, of a plastic material, as shown in Fig. 2, and when the plastermodel is removed from the plastic material which serves as a mold amatrix 11 is formed, as shown in ig. 3, in which matrix a metal model 12is cast, which is the duplicate ofv the plaster model and itscasing-ring. B, which forms the mold, is shown as being of plasticmaterial, yet it may be of sand, if desired. This metal model isshownclearly in Fig. 4, and a ring 13, having an inner tapering surface14, is fitted to the outer cir cumferential surface of the metal modeljust below the shaping-face thereof, which shaping-face is adapted toreceive the plate 0 to be swaged. The ring 13 fits in like manner uponthe casing-ring 10 of the plaster model A.

An upper die D is employed in connection with both the plaster and themetal model. This upper die D is cylindrical and is solid except at itslower portion, in which portion a cavity 15 is produced adapted toreceive a plastic material-such as wax, for example. At the lower edgeof the upper die D downwardly-extending guide-fingers 17 are formedwhich serve to direct the employed model and its ring 13 evenly to theWax or plastic filling 16 of the said upper die, as shown in Figs. 5 and6. The upper die D is preferably provided with an enlargement or a knob14 at its top adapted to be struck by a hammer or other suitable tool. Acompleted or swaged upper plate E is shown in Fig. 7.

The operation is substantially as follows: After securing a plastermodel of the mouth to which the plate is to be fitted, as has beenstated, the model is set in the casing-ring 10, and this casing-ring 10is made tapering, so

that it may be readily withdrawn from the.

sand mold or plastic mold in which the metal model is to be cast. Themetal model 12 is used in the beginning of the swaging process, as afterthis die or model is made the plate which is placed on the shaping-faceof the metal model is worked with a mallet or a like tool until saidplate conforms to the shapingface of the model which represents thegums. The ring 13 is now placed over the metal model, and this model isused as a lower die to mate the upper die D. The cavity 15 in While theblock or bed.

the upper die D is now filled with soft wax or some other plasticmaterial, and the under face of this wax 16 is made to engage with theupper surface of the ring 13, the plate 0, and the exposed upper face ofthe metal model. The upper die is now driven down over the metal model12 or lower die, and as the ring l3,which surrounds the metal model,passes up between the guides 17 and approaches the lower edge of thecavity in the upper die the waxis confined in said cavity, offeringsufiicient resistance to adaptthe plate perfectly to theshaping-surfaces of the metal model. This operation obviates thenecessity of making a counter-die for each case and does the workperfectly. Then the plate 0 has been adapted to the metal die, saidmetal die is removed and the plateis transferred to the plaster die ormodel A, and the ring 13 is placed around the casing 10 of the plasterdie or model. This plaster die or model A is then placed in the samerelation to the upper die D as the metal die or model 12, and the sameswaging process is repeated. In this latter processthat of swaging theplate directly on the plaster modellies the principal advantage "of thedevice. The

plastic material 16, confined between the plate 0 and the solid surfaceof the upper die D, adapts itself so perfectly to the plate and model orlower die and the pressure as the upper die advances is so equalizedthat there is no tendency to fracture the model, the pressure being thesame in all directions.

Among'the ad vantages that may be claimed for this means of swagingdental plates may be mentioned the following: First, it furnishes asimple and elfective way of swa'ging a metal plate directly on a plastermodel, thus making a more accurately-fitting plate; second, it obviates'the necessity of making counter-dies, 'thus saving much time and labor,and, third, the plastic material adapting itself perfectly to theirregularities of the plate and the die or model the force is always atthe right point, thus adapting the plate more accurately to the die thanunder the usual process of swaging. Furthermore, the

swaging process ahove mentioned does not scar the plate.

Having thus described my invention, I

claim as new and desire to secure by Letters Pate'nt 1. Means forswa'ging dental plates, comprising an upper and a lower die, thelowerdie being a tapering model and 'hav iu g a ring surrounding it andthe upper die having a cavity into which the lower die projects, and aplastic material located within the cavity of the upper die, the plasticmaterial being in contact with the working face of the lower die andconfined therein by the said lower die or model, as set forth.

2. Means for swaging dental plates, consisting of an upper die having acavity therein and guide-fingers extending from the lower edge of saidcavity, the cavity being adapted to receive a plastic material, and alower die or model upon which the plate to be swaged is placed adaptedto extend into the cavity with its working face in contact with theplastic material, the upper exterior surface portion of which modelbelow its shaping-face fits snugly to the inner wall of the cavity inthe upper die, the upper die being movable to and from the lower die ormodel, as described.

3. Means for swaging dental plates, comprising an upper die having acavity in its lower portion adapted to receive wax, and a lower die ormodel, upon the shaping-face of which the plate to be swaged is placed,which model is of plaster fitted in a 'ri ng-like casing and is adaptedto enter and fit into the lower portion of said cavity in the upper die,with its Working face in contact with the wax.

4. Means for swaging dental plates, consisting of an upper die having acavity inits bottom portion, and guidefingers extending downward fromthe lower edge of said cavity, the cavity in the upper die being adaptedto receive a plastic material and a lower die or model of plaster, theplate to be swaged being adapted to lie on or over the shapingsurfaceofthe said lower plaster die or model, and a ring of harder materialsurrounding the plaster die or model at a point adjacent to itsshaping-face, which ring is adapted to engage with the inner wall of thesaid cavity, whereby when the upper die is forced in direction of thelower die or model, the plastic material in the said cavity of the upperdie is confined by the model and its attached ring and forced intocontact with the working face "of the lower die, as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two s'uhscriloing witnesses.

NORRIS CLAYTON \Vitnesses T. A. LEONARD, FRANK OoLVILLE.

LEONARD.

